function blink(speed) {
    if (speed) {
        //if (document.all)
            setInterval("blink()", speed*1000)
        //return;
    }
    
    var blink = getElementsByClass("blink")
    for (var i=0; i<blink.length; i++)
        blink[i].style.visibility = blink[i].style.visibility == "" ? "hidden" : ""
}

function getElementsByClass( searchClass, domNode, tagName) { 
	if (domNode == null) domNode = document;
	if (tagName == null) tagName = '*';
	var el = new Array();
	var tags = domNode.getElementsByTagName(tagName);
	var tcl = " "+searchClass+" ";
	for(i=0,j=0; i<tags.length; i++) { 
		var test = " " + tags[i].className + " ";
		if (test.indexOf(tcl) != -1) 
			el[j++] = tags[i];
	} 
	return el;
}